4.2.8-ckt5 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
commit a7f775428b8f5808815c0e3004020cedb94cbe3b upstream.
... otherwise d_is_symlink() above might have nothing to do with
the inode value we've got.
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
fs/namei.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/fs/namei.c b/fs/namei.c
index 1047096..414561f 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1714,6 +1714,11 @@ static inline int should_follow_link(struct nameidata *nd, struct path *link,
return 0;
if (!follow)
return 0;
+ /* make sure that d_is_symlink above matches inode */
+ if (nd->flags & LOOKUP_RCU) {
+ if (read_seqcount_retry(&link->dentry->d_seq, seq))
+ return -ECHILD;
+ }
return pick_link(nd, link, inode, seq);
}
--
2.7.0
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